APA

BUOL S. R. R., . (2003). Soil genesis and classification. Lowa: Low state press.

Chicago

BUOL S.W./SOUTHARD R.J./GRAHAM R.C, . 2003. Soil genesis and classification. Lowa: Low state press.

Harvard

BUOL S. R. R., . (2003). Soil genesis and classification. Lowa: Low state press.

MLA

BUOL S.W./SOUTHARD R.J./GRAHAM R.C, . Soil genesis and classification. Lowa: Low state press. 2003.